Did you know that in Russia salaries can be white, black and sometimes grey?
чёрная зарплата (“black salary”) is the salary from which no taxes were paid. For example, you work somewhere, but not officially, so you get “black salary.” If they fire you, you won't be able to prove you worked there.
белая зарплата (“white salary”) is an official, legal salary from which you and your employer pay taxes, it’s what you officially get.
There is also a term «зарплата в конверте» - “salary in the envelope”, usually meaning black salary. You receive your salary in cash in an envelope.
There can also be серая зарплата, “grey salary”, when part of your salary is legal, white, and the other is not.
Of course black and grey salaries are illegal in Russia, but unfortunately they are quite common. Sometimes someone is ready to hire you only if you accept the black salary.
У него серая зарплата. - He gets grey salary.
Сколько ты чёрными получаешь? - What's your black salary?
Платить зарплату чёрными незаконно. - To pay black salary is illegal.